I see a lot of discussion about using cellphones for connectivity, but if she only needs access when she is not driving the built in wireless should work just fine...no need for additional equipment or services.
Most large truck stops and many hotel/motels now offer free or inexpensive wireless. The laptop should auto-detect any available access points and most likely she will only need a mouse click to connect.
The only reason she would need data access via cellphone is if she needs to have on demand connectivity between rest stops.
Thanks, that little bit of detail was something I didn't know for sure. I thought something like an antenna might have been necessary, but apparently not. I surmise the Wireless card contains a radio transceiver, correct?